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È˺È×íºó£¬Í¨³£¸Ð¾õÔÎͷתÏò£¬´óÄÔºÃÏñ²»×ªÁËÒ»Ñù£¬µ«¶ÔÓÚ´óÄÔΪʲô»á³öÏÖÕâÑùµÄ·´Ó¦È´²»Çå³þ¡£ÃÀ¹úÒ»Ïî×îÐÂÑо¿¾Í²éÃ÷ÁË×í¾Æ¹ý³ÌÖдóÄԻµÄ¾ßÌå·Ö×Ó»úÖÆ¡£Ñо¿³ÉÈËÔ±³ÆÕ⽫ÓÐÖúÓÚ¿ª·¢Õë¶Ô¾Æ¾«Öж¾¡¢Ò©ÎïÉÏñ«ÉõÖÁñ²ðïÖ¢µÄÐÂÐÍÁÆ·¨¡£ ÃÀ¹úË÷¶û¿ËÉúÎïÑо¿Ëù¿ÆÑÐÈËÔ±ÔÚÐÂÒ»ÆÚ¡¶×ÔÈ»¡¤Éñ¾¿ÆÑ§¡·ÔÓÖ¾Éϱ¨¸æËµ£¬¾Æ¾«³É·Ö¼´ÒÒ´¼£¬±»ÈÏΪ»á¸Ä±ä´óÄÔÄÚÉñ¾Ï¸°ûÖ®¼äµÄÐźŴ«µÝ¡£´ËǰһЩÑо¿ÈÏΪ£¬ÒÒ´¼»áÖ±½ÓÓëÀë×ÓͨµÀµ°°×ÖÊÏ໥×÷Ó㬵«µ½Ä¿Ç°¶¼Ã»ÓвéÃ÷Ï໥×÷ÓõľßÌåλÖᣠË÷¶û¿ËÉúÎïÑо¿Ëù×îеÄÑо¿·¢ÏÖ£¬ÒÒ´¼Óë´óÄÔÖÐÒ»ÖÖ¼ØÀë×ÓͨµÀµ°°×ÖÊÄÚµÄij¸öÌØ¶¨Î»ÖÃÏ໥×÷Óá£Ò½Ñ§Ñо¿ÒÑÖª£¬ÕâÖÖÃûΪGIRKµÄ¼ØÀë×ÓͨµÀÔÚÒ©ÎïÀÄÓúÍñ²ðï·¢×÷ʱµÄ´óÄԻÖаçÑݹؼü½ÇÉ«¡£ ×îеÄʵÑé¾Í·¢ÏÖ£¬ÒÒ´¼Óëµ°°×ÖÊÄÚµÄÌØ¶¨Î»ÖýáºÏºó£¬ÕâһͨµÀ±»¼¤»î¡°¿ªÆô¡±£¬Éñ¾Ï¸°ûÖ®¼äµÄ¡°Í¨ÐÅÁªÂ硱»á±»¼õÈõ£¬´óÄÔÄÚÏ൱ÓÚ²úÉúÁË¡°¶Ì·¡±¡£ Ñо¿ÈËԱ˵£¬²éÃ÷ÒÒ´¼¼¤»îGIRKͨµÀµÄ¾ßÌåλÖ㬽«ÓÐÖúÓÚ¿ª·¢ÖÎÁÆÏà¹Ø´óÄÔ¼²²¡µÄÐÂÁÆ·¨¡£±ÈÈ磬¿ÉÒÔ¿ª·¢³öÒ»ÖÖ°ÐÏòÒ©ÎʹÒÒ´¼ÎÞ·¨ÓëͨµÀµ°°×ÖʽáºÏ£¬À´ÖÎÁƾƾ«ÒÀÀµ¡£ Nature Neuroscience 28 June 2009 | doi:10.1038/nn.2358 A discrete alcohol pocket involved in GIRK channel activation Prafulla Aryal1,2, Hay Dvir3, Senyon Choe2,3 & Paul A Slesinger1,2 Abstract Ethanol modifies neural activity in the brain by modulating ion channels. Ethanol activates G protein¨Cgated inwardly rectifying K+ channels, but the molecular mechanism is not well understood. Here, we used a crystal structure of a mouse inward rectifier containing a bound alcohol and structure-based mutagenesis to probe a putative alcohol-binding pocket located in the cytoplasmic domains of GIRK channels. Substitutions with bulkier side-chains in the alcohol-binding pocket reduced or eliminated activation by alcohols. By contrast, alcohols inhibited constitutively open channels, such as IRK1 or GIRK2 engineered to strongly bind PIP2. Mutations in the hydrophobic alcohol-binding pocket of these channels had no effect on alcohol-dependent inhibition, suggesting an alternate site is involved in inhibition. Comparison of high-resolution structures of inwardly rectifying K+ channels suggests a model for activation of GIRK channels using this hydrophobic alcohol-binding pocket. These results provide a tool for developing therapeutic compounds that could mitigate the effects of alcohol. 1 Peptide Biology Laboratory, The Salk Institute for Biological Studies, La Jolla, California, USA. 2 Graduate Program in Biology, Division of Biology, University of California, San Diego, La Jolla, California, USA. 3 Structural Biology Laboratory, The Salk Institute for Biological Studies, La Jolla, California, USA. [ Last edited by guotieying on 2009-6-30 at 09:18 ] |
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